---------------------------------------------------------- M14PEngines-List Digest Archive --- Total Messages Posted Sun 07/09/23: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:00 AM - Re: CHT (Anthony Savarese) 2. 10:12 AM - Re: CHT (Mark Bitterlich) ________________________________ Message 1 _____________________________________ Time: 05:00:18 AM PST US From: Anthony Savarese Subject: Re: M14PEngines-List: CHT Split the CHT probes between cylinders 3 & 4. With both probes on the same spark plug, the spark plug firing tip is significantly pulled out of the combustion chamber. Also, regardless of whether youre using a Russian/Chinese or automotive spark plug, the plug with the CHT prob should not have a washer on it as that exasperates the issue just mentioned. Dennis Sent from my iPhone > On Jul 8, 2023, at 9:42 PM, Snazpappy wrote: > > > I have a Yak 52 TW. The CHT in the back cockpit is mostly inop indicating zero. After engine startup I noticed the CHT in the rear cockpit would indicate normally up through about 200 degrees then the gauge would appear to fail and indicate bottom of the scale. I did a little troubleshooting today and put both CHT probes in my dewalt heat gun which can be set in 50 degree increments. Both gauges read normal up to about 200 degrees F. When the heat was increased beyond 200 degrees, the rear gauge appeared to fail and the front gauge read normally. I decided to isolate the rear CHT probe so I put just one probe in the heat gun to find which was the rear and found the rear gauge continued working when it was isolated but would read 50-100 degrees lower then the set heat, when set above 200 degrees, but the gauge continued to function. I then tried to put the front probe back in the gun, with the rear probe and as soon as I put the two probes together the rear gauge again! > appeared to fail. > > Both CHT thermocouple are pancaked together and put on the same spark plug on the back of the engine. I have decided for now to replace both thermocouples to see if this fixes the problem, not sure what the problem may be, and was wondering if anyone has any ideas why my gauges are acting this way. I checked the wiring diagram and both thermocouples are totally isolated from each other other than be pancaked on the same plug. Both thermocouple s wiring are running through their own protective sleeves. > > Any ideas or suggestions are appreciated. > > Thanks > > Todd > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=511077#511077 > > > > > > > > > ________________________________ Message 2 _____________________________________ Time: 10:12:21 AM PST US Subject: Re: M14PEngines-List: CHT From: Mark Bitterlich SGV5IERlbm5pcyHCoMKgQmVzaWRlcyBjb3JyZWN0aW5nIHNwYXJrIHBsdWcgZGVwdGggaW50byB0 aGUgY29tYnVzdGlvbiBjaGFtYmVyIChhbiBpc3N1ZSB0aGF0IHNob3VsZCBiZSBpbW1lZGlhdGVs eSBjb3JyZWN0ZWQgb2YgY291cnNlKSwgSSdtIGdvaW5nIHRvIGdvIG91dCBvbiBhIGxpbWIgYW5k IGJldCBpdCB3aWxsIGFsc28gY3VyZSBoaXMgYmFja3NlYXQgQ0hUIGdhZ2UgaXNzdWUuwqBGYWls aW5nIHRoYXQsIGl0IGNhbiBvbmx5IGJlIHRoZSB0aGVybW9jb3VwbGUgaXRzZWxmLCBvciB0aGUg Y29ubmVjdGlvbiB3aGVyZSBpdCBzcGxpY2VzIGludG8gdGhlIHN0YW5kYXJkIHdpcmluZy7CoEFu eXdheSwgZXhjZWxsZW50IGFzIHVzdWFsLsKgTWFyawotLS0tLS0tLSBPcmlnaW5hbCBtZXNzYWdl 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